Hello, how to put a thick wire on the carburetor throttle to limit the throttle?

It depends on the structure of the carburetor. If it is plunger type, put a hollow tube on the throttle cable above the plunger, and let the tube hold against the carburetor plunger and the upper cover to limit the large throttle (the earliest factory practice of Happiness 250). If it is a rotary valve throttle, it is not easy to change it, but we can try to limit the maximum rotation angle of the rotary valve to limit the large throttle.